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-rw-r--r--automake.head.mk56
-rw-r--r--automake.tail.mk140
-rw-r--r--build-aux/Makefile.each.head/00-dist.mk20
-rw-r--r--build-aux/Makefile.each.tail/10-std.mk46
-rw-r--r--build-aux/Makefile.once.head/00-dist.mk44
-rw-r--r--build-aux/Makefile.once.head/00-gnuconf.mk149
-rw-r--r--build-aux/Makefile.once.head/00-write-ifchanged.mk1
-rw-r--r--build-aux/Makefile.once.head/10-std.mk39
-rw-r--r--build-aux/Makefile.once.tail/00-dist.mk27
-rwxr-xr-xbuild-aux/write-ifchanged25
10 files changed, 547 insertions, 0 deletions
diff --git a/automake.head.mk b/automake.head.mk
new file mode 100644
index 0000000..431f14d
--- /dev/null
+++ b/automake.head.mk
@@ -0,0 +1,56 @@
+# Copyright (C) 2015-2016 Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+_am = am_
+
+_am_noslash = $(patsubst %/.,%,$(patsubst %/,%,$1))
+# These are all $(call _am_func,parent,child)
+#_am_relto = $(if $2,$(shell realpath -sm --relative-to='$1' $2))
+_am_is_subdir = $(filter $(abspath $1)/%,$(abspath $2)/.)
+_am_relto_helper = $(if $(call _am_is_subdir,$1,$2),$(patsubst $1/%,%,$(addsuffix /.,$2)),$(addprefix ../,$(call _am_relto_helper,$(patsubst %/,%,$(dir $1)),$2)))
+_am_relto = $(call _am_noslash,$(call _am_relto_helper,$(call _am_noslash,$(abspath $1)),$(call _am_noslash,$(abspath $2))))
+# Note that _am_is_subdir says that a directory is a subdirectory of
+# itself.
+_am_path = $(call _am_relto,.,$1)
+am_path = $(foreach p,$1,$(call _am_relto,.,$p))
+
+## Declare the default target
+all: build
+.PHONY: all
+
+## Set outdir and srcdir (assumes that topoutdir and topsrcdir are
+## already set)
+outdir := $(call _am_path,$(dir $(lastword $(filter-out %.mk,$(MAKEFILE_LIST)))))
+srcdir := $(call _am_path,$(topsrcdir)/$(call _am_relto,$(topoutdir),$(outdir)))
+
+_am_included_makefiles := $(_am_included_makefiles) $(call _am_path,$(outdir)/Makefile)
+
+## Empty variables for use by each Makefile
+$(_am)subdirs =
+$(_am)depdirs =
+
+$(_am)src_files =
+$(_am)gen_files =
+$(_am)cfg_files =
+$(_am)out_files =
+$(_am)sys_files =
+
+$(_am)clean_files =
+$(_am)slow_files =
+
+ifeq ($(_am_NO_ONCE),)
+include $(topsrcdir)/common.once.head.mk
+endif
+include $(topsrcdir)/common.each.head.mk
diff --git a/automake.tail.mk b/automake.tail.mk
new file mode 100644
index 0000000..ba31935
--- /dev/null
+++ b/automake.tail.mk
@@ -0,0 +1,140 @@
+# Copyright (C) 2015-2016 Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+include $(topsrcdir)/common.each.tail.mk
+
+
+# Aggregate variables
+
+# Add some more defaults to the *_files variables
+$(_am)clean_files += $($(_am)gen_files) $($(_am)cfg_files) $($(_am)out_files)
+
+# Now namespace the *_files variables
+define _am_save_variables
+_am_src_files/$(outdir) = $(addprefix $(srcdir)/,$($(_am)src_files))
+_am_gen_files/$(outdir) = $(addprefix $(srcdir)/,$($(_am)gen_files))
+_am_cfg_files/$(outdir) = $(addprefix $(outdir)/,$($(_am)cfg_files))
+_am_out_files/$(outdir) = $(addprefix $(outdir)/,$($(_am)out_files))
+_am_sys_files/$(outdir) = $(addprefix $(DESTDIR),$($(_am)sys_files))
+_am_clean_files/$(outdir) = $(addprefix $(outdir)/,$($(_am)clean_files))
+_am_slow_files/$(outdir) = $(addprefix $(outdir)/,$($(_am)slow_files))
+_am_subdirs/$(outdir) = $($(_am)subdirs)
+endef
+$(eval $(_am_save_variables))
+
+# And add them to the $(parent)_*_files variables (if applicable)
+define _am_add_subdir
+_am_src_files/%(outdir) += $(_am_src_files/%(subdir))
+_am_gen_files/%(outdir) += $(_am_gen_files/%(subdir))
+_am_cfg_files/%(outdir) += $(_am_cfg_files/%(subdir))
+_am_out_files/%(outdir) += $(_am_out_files/%(subdir))
+_am_sys_files/%(outdir) += $(_am_sys_files/%(subdir))
+_am_clean_files/%(outdir) += $(_am_clean_files/%(subdir))
+_am_slow_files/%(outdir) += $(_am_slow_files/%(subdir))
+endef
+$(foreach subdir,$(call _am_path,$(addprefix $(outdir)/,$($(_am)subdirs))),$(eval $(subst %(outdir),$(outdir),$(subst %(subdir),$(subdir),$(value _am_add_subdir)))))
+
+_am_outdirs := $(_am_outdirs) $(outdir)
+
+
+# Do some per-directory magic
+
+_am_phony = build install uninstall mostlyclean clean distclean maintainer-clean check
+
+.PHONY: $(addprefix $(outdir)/,$(_am_phony))
+
+$(addprefix $(outdir)/,uninstall mostlyclean clean distclean maintainer-clean)::
+ $(RM) -- $(filter-out %/,$(sort $(_am_$(@F)/$(@D))))
+ $(RM) -r -- $(filter %/,$(sort $(_am_$(@F)/$(@D))))
+ $(RMDIRS) $(sort $(dir $(patsubst %/,%,$(_am_$(@F)/$(@D))))) 2>/dev/null || $(TRUE)
+
+# 'build' and 'install' must be defined later, because the
+# am_*_files/* variables might not be complete yet.
+
+
+# Include Makefiles from other directories
+
+define _am_nl
+
+
+endef
+
+$(foreach _am_NO_ONCE,y,\
+ $(foreach makefile,$(foreach dir,$($(_am)subdirs) $($(_am)depdirs),$(call _am_path,$(outdir)/$(dir)/Makefile)),\
+ $(eval include $(filter-out $(_am_included_makefiles),$(makefile)))))
+
+
+# This only gets evaluated once, after all of the other Makefiles are read
+ifeq ($(_am_NO_ONCE),)
+# Empty directory-level variables
+outdir = /bogus
+srcdir = /bogus
+
+$(_am)subdirs =
+$(_am)depdirs =
+
+$(_am)src_files =
+$(_am)gen_files =
+$(_am)cfg_files =
+$(_am)out_files =
+$(_am)sys_files =
+$(_am)clean_files =
+$(_am)slow_files =
+
+_am_clean_files/$(topoutdir) += $(topoutdir)/$(PACKAGE)-$(VERSION).tar.gz
+$(addprefix $(topoutdir)/,mostlyclean clean distclean maintainer-clean) ::
+ $(RM) -r -- $(topoutdir)/$(PACKAGE)-$(VERSION)
+
+define _am_directory_rules
+# Constructive phony targets
+$(outdir)/build : $(_am_out_files/%(outdir))
+$(outdir)/install: $(_am_sys_files/%(outdir))
+# Destructive phony targets
+_am_uninstall/%(outdir) = $(_am_sys_files/%(outdir))
+_am_mostlyclean/%(outdir) = $(filter-out $(_am_slow_files/%(outdir)) $(_am_cfg_files/%(outdir)) $(_am_gen_files/%(outdir)) $(_am_src_files/%(outdir)),$(_am_clean_files/%(outdir)))
+_am_clean/%(outdir) = $(filter-out $(_am_cfg_files/%(outdir)) $(_am_gen_files/%(outdir)) $(_am_src_files/%(outdir)),$(_am_clean_files/%(outdir)))
+_am_distclean/%(outdir) = $(filter-out $(_am_gen_files/%(outdir)) $(_am_src_files/%(outdir)),$(_am_clean_files/%(outdir)))
+_am_maintainer-clean/%(outdir) = $(filter-out $(_am_src_files/%(outdir)),$(_am_clean_files/%(outdir)))
+endef
+$(foreach outdir,$(_am_outdirs),$(eval $(subst %(outdir),$(outdir),$(value _am_directory_rules))))
+
+# Add the `dist` target
+.PHONY: dist
+dist: $(topoutdir)/$(PACKAGE)-$(VERSION).tar.gz
+$(topoutdir)/$(PACKAGE)-$(VERSION).tar.gz: $(topoutdir)/$(PACKAGE)-$(VERSION)
+ $(TAR) czf $@ -C $(<D) $(<F)
+_am_copyfile = $(MKDIRS) $(dir $2) && $(CP) -T $1 $2
+_am_addfile = $(call _am_copyfile,$3,$2/$(call _am_relto,$1,$3))
+$(topoutdir)/$(PACKAGE)-$(VERSION): $(_am_src_files/$(topoutdir)) $(_am_gen_files/$(topoutdir))
+ $(RM) -r $@
+ @PS4='' && set -x && \
+ $(MKDIR) $(@D)/tmp.$(@F).$$$$ && \
+ $(foreach f,$^,$(call _am_addfile,$(topsrcdir),$(@D)/tmp.$(@F).$$$$,$f) &&) \
+ $(MV) $(@D)/tmp.$(@F).$$$$ $@ || $(RM) -r $(@D)/tmp.$(@F).$$$$
+
+include $(topsrcdir)/common.once.tail.mk
+
+# For some reason I can't explain, RM doesn't really get set with ?=
+CP ?= cp
+MKDIR ?= mkdir
+MKDIRS ?= mkdir -p
+MV ?= mv
+RM = rm -f
+RMDIRS ?= rmdir -p
+TAR ?= tar
+TRUE ?= true
+
+.PHONY: noop
+endif
diff --git a/build-aux/Makefile.each.head/00-dist.mk b/build-aux/Makefile.each.head/00-dist.mk
new file mode 100644
index 0000000..a094305
--- /dev/null
+++ b/build-aux/Makefile.each.head/00-dist.mk
@@ -0,0 +1,20 @@
+# Copyright (C) 2015-2016 Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+ifeq ($(outdir),$(topoutdir))
+std.clean_files += $(addprefix $(dist.pkgname)-*,$(dist.exts) .tar /)
+endif
+
+$(outdir)/dist: $(addprefix $(topoutdir)/$(dist.pkgname)-$(dist.version),$(dist.exts))
diff --git a/build-aux/Makefile.each.tail/10-std.mk b/build-aux/Makefile.each.tail/10-std.mk
new file mode 100644
index 0000000..5150a71
--- /dev/null
+++ b/build-aux/Makefile.each.tail/10-std.mk
@@ -0,0 +1,46 @@
+# Copyright (C) 2015-2016 Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+# Add some more defaults to the *_files variables
+std.clean_files += $(std.gen_files) $(std.cfg_files) $(std.out_files)
+
+# Fix each variable at its current value to avoid any weirdness
+$(foreach c,src gen cfg out sys clean slow,$(eval std.$c_files := $$(std.$c_files)))
+
+# Make each of the standard variables relative to the correct directory
+std.src_files := $(patsubst ./%,%,$(addprefix $(srcdir)/,$(std.src_files)))
+std.gen_files := $(patsubst ./%,%,$(addprefix $(srcdir)/,$(std.gen_files)))
+std.cfg_files := $(patsubst ./%,%,$(addprefix $(outdir)/,$(std.cfg_files)))
+std.out_files := $(patsubst ./%,%,$(addprefix $(outdir)/,$(std.out_files)))
+std.sys_files := $(addprefix $(DESTDIR),$(std.sys_files))
+std.clean_files := $(patsubst ./%,%,$(addprefix $(outdir)/,$(std.clean_files)))
+std.slow_files := $(patsubst ./%,%,$(addprefix $(outdir)/,$(std.slow_files)))
+
+# Creative targets
+$(outdir)/build : $(std.out_files)
+$(outdir)/install : $(std.sys_files)
+$(outdir)/installdirs: $(sort $(dir $(std.sys_files)))
+
+# Destructive targets
+_std.uninstall/$(outdir) := $(std.sys_files)
+_std.mostlyclean/$(outdir) := $(filter-out $(std.slow_files) $(std.cfg_files) $(std.gen_files) $(std.src_files),$(std.clean_files))
+_std.clean/$(outdir) := $(filter-out $(std.cfg_files) $(std.gen_files) $(std.src_files),$(std.clean_files))
+_std.distclean/$(outdir) := $(filter-out $(std.gen_files) $(std.src_files),$(std.clean_files))
+_std.maintainer-clean/$(outdir) := $(filter-out $(std.src_files),$(std.clean_files))
+$(addprefix $(outdir)/,uninstall mostlyclean clean distclean maintainer-clean): %: %-hook
+ $(RM) -- $(sort $(filter-out %/,$(_std.$(@F)/$(@D))))
+ $(RM) -r -- $(sort $(filter %/,$(_std.$(@F)/$(@D))))
+ $(RMDIR_P) $(sort $(dir $(_std.$(@F)/$(@D)))) 2>/dev/null || $(TRUE)
+$(foreach t,uninstall mostlyclean clean distclean maintainer-clean, $(outdir)/$t-hook)::
+.PHONY: $(foreach t,uninstall mostlyclean clean distclean maintainer-clean, $(outdir)/$t-hook)
diff --git a/build-aux/Makefile.once.head/00-dist.mk b/build-aux/Makefile.once.head/00-dist.mk
new file mode 100644
index 0000000..d5bfcd3
--- /dev/null
+++ b/build-aux/Makefile.once.head/00-dist.mk
@@ -0,0 +1,44 @@
+# Copyright (C) 2015-2016 Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# Developer configuration
+
+dist.exts ?= .tar.gz
+dist.pkgname ?= $(PACKAGE)
+dist.version ?= $(VERSION)
+
+ifeq ($(dist.pkgname),)
+$(error dist.pkgname must be set)
+endif
+ifeq ($(dist.version),)
+$(error dist.version must be set)
+endif
+
+# User configuration
+
+CP ?= cp
+GZIP ?= gzip
+MKDIR ?= mkdir
+MKDIR_P ?= mkdir -p
+MV ?= mv
+RM ?= rm -f
+TAR ?= tar
+
+GZIPFLAGS ?= $(GZIP_ENV)
+GZIP_ENV ?= --best
+
+# Implementation
+
+at.phony += dist
diff --git a/build-aux/Makefile.once.head/00-gnuconf.mk b/build-aux/Makefile.once.head/00-gnuconf.mk
new file mode 100644
index 0000000..79ecc34
--- /dev/null
+++ b/build-aux/Makefile.once.head/00-gnuconf.mk
@@ -0,0 +1,149 @@
+# Copyright (C) 2016 Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# This file is based on ยง7.2 "Makefile Conventions" of the release of
+# the GNU Coding Standards dated April 13, 2016.
+
+gnuconf.pkgname ?= $(PACKAGE)
+ifeq ($(gnuconf.pkgname),)
+$(error gnuconf.pkgname must be set)
+endif
+
+# 7.2.2: Utilities in Makefiles
+# -----------------------------
+
+# It's ok to hard-code these commands in rules, but who wants to
+# memorize the list of what's ok?
+AWK ?= awk
+CAT ?= cat
+CMP ?= cmp
+CP ?= cp
+DIFF ?= diff
+ECHO ?= echo
+EGREP ?= egrep
+EXPR ?= expr
+FALSE ?= false
+GREP ?= grep
+INSTALL_INFO ?= install-info
+LN ?= ln
+LS ?= ls
+MKDIR ?= mkdir
+MV ?= mv
+PRINTF ?= printf
+PWD ?= pwd
+RM ?= rm
+RMDIR ?= rmdir
+SED ?= sed
+SLEEP ?= sleep
+SORT ?= sort
+TAR ?= tar
+TEST ?= test
+TOUCH ?= touch
+TR ?= tr
+TRUE ?= true
+
+# These must be user-configurable
+AR ?= ar
+ARFLAGS ?=
+BISON ?= bison
+BISONFLAGS ?=
+CC ?= cc
+CCFLAGS ?= $(CFLAGS)
+FLEX ?= flex
+FLEXFLAGS ?=
+INSTALL ?= install
+INSTALLFLAGS ?=
+LD ?= ld
+LDFLAGS ?=
+LDCONFIG ?= ldconfig #TODO
+LDCONFIGFLAGS ?=
+LEX ?= lex
+LEXFLAGS ?= $(LFLAGS)
+#MAKE
+MAKEINFO ?= makeinfo
+MAKEINFOFLAGS ?=
+RANLIB ?= ranlib #TODO
+RANLIBFLAGS ?=
+TEXI2DVI ?= texi2dvi
+TEXI2DVIFLAGS ?=
+YACC ?= yacc
+YACCFLAGS ?= $(YFLAGS)
+
+CFLAGS ?=
+LFLAGS ?=
+YFLAGS ?=
+
+LN_S ?= ln -s #TODO
+
+CHGRP ?= chgrp
+CHMOD ?= chmod
+CHOWN ?= chown
+MKNOD ?= mknod
+
+# 7.2.3 Variables for Specifying Commands
+# ---------------------------------------
+
+INSTALL_PROGRAM ?= $(INSTALL)
+INSTALL_DATA ?= ${INSTALL} -m 644
+
+# 7.2.5 Variables for Installation Directories
+# --------------------------------------------
+
+# Root for the installation
+prefix ?= /usr/local
+exec_prefix ?= $(prefix)
+# Executable programs
+bindir ?= $(exec_prefix)/bin
+sbindir ?= $(exec_prefix)/sbin
+libexecdir ?= $(exec_prefix)/libexec
+# Data files
+datarootdir ?= $(prefix)/share
+datadir ?= $(datarootdir)
+sysconfdir ?= $(prefix)/etc
+sharedstatedir ?= $(prefix)/com
+localstatedir ?= $(prefix)/var
+runstatedir ?= $(localstatedir)/run
+# Specific types of files
+includedir ?= $(prefix)/include
+oldincludedir ?= /usr/include
+docdir ?= $(datarootdir)/doc/$(gnuconf.pkgname)
+infodir ?= $(datarootdir)/info
+htmldir ?= $(docdir)
+dvidir ?= $(docdir)
+pdfdir ?= $(docdir)
+psdir ?= $(docdir)
+libdir ?= $(exec_prefix)/lib
+lispdir ?= $(datarootdir)/emacs/site-lisp
+localedir ?= $(datarootdir)/locale
+
+mandir ?= $(datarootdir)/man
+man1dir ?= $(mandir)/man1
+man2dir ?= $(mandir)/man2
+man3dir ?= $(mandir)/man3
+man4dir ?= $(mandir)/man4
+man5dir ?= $(mandir)/man5
+man6dir ?= $(mandir)/man6
+man7dir ?= $(mandir)/man7
+man8dir ?= $(mandir)/man8
+
+manext ?= .1
+man1ext ?= .1
+man2ext ?= .2
+man3ext ?= .3
+man4ext ?= .4
+man5ext ?= .5
+man6ext ?= .6
+man7ext ?= .7
+man8ext ?= .8
diff --git a/build-aux/Makefile.once.head/00-write-ifchanged.mk b/build-aux/Makefile.once.head/00-write-ifchanged.mk
new file mode 100644
index 0000000..79ef1c4
--- /dev/null
+++ b/build-aux/Makefile.once.head/00-write-ifchanged.mk
@@ -0,0 +1 @@
+WRITE_IFCHANGED = $(topsrcdir)/build-aux/write-ifchanged
diff --git a/build-aux/Makefile.once.head/10-std.mk b/build-aux/Makefile.once.head/10-std.mk
new file mode 100644
index 0000000..3e058ec
--- /dev/null
+++ b/build-aux/Makefile.once.head/10-std.mk
@@ -0,0 +1,39 @@
+# Copyright (C) 2015-2016 Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# Declare the default target
+all: build
+.PHONY: all noop
+
+# Standard creative PHONY targets
+at.phony += build install installdirs
+# Standard destructive PHONY targets
+at.phony += uninstall mostlyclean clean distclean maintainer-clean
+
+at.dirlocal += std.src_files
+at.dirlocal += std.gen_files
+at.dirlocal += std.cfg_files
+at.dirlocal += std.out_files
+at.dirlocal += std.sys_files
+at.dirlocal += std.clean_files
+at.dirlocal += std.slow_files
+
+# User configuration
+
+DESTDIR ?=
+
+RM ?= rm -f
+RMDIR_P ?= rmdir -p
+TRUE ?= true
diff --git a/build-aux/Makefile.once.tail/00-dist.mk b/build-aux/Makefile.once.tail/00-dist.mk
new file mode 100644
index 0000000..b8b7733
--- /dev/null
+++ b/build-aux/Makefile.once.tail/00-dist.mk
@@ -0,0 +1,27 @@
+# Copyright (C) 2015-2016 Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+_dist.copyfile = $(MKDIR_P) $(dir $2) && $(CP) -T $1 $2
+_dist.addfile = $(call _dist.copyfile,$3,$2/$(call at.relto,$1,$3))
+$(topoutdir)/$(dist.pkgname)-$(dist.version): $(foreach v,$(filter std.src_files/% std.gen_files/%,$(.VARIABLES)),$($v))
+ $(RM) -r $@ $(@D)/tmp.$(@F)
+ $(MKDIR) $(@D)/tmp.$(@F)
+ $(foreach f,$^,$(call _dist.addfile,$(topsrcdir),$(@D)/tmp.$(@F),$f)$(at.nl))
+ $(MV) $(@D)/tmp.$(@F) $@ || $(RM) -r $(@D)/tmp.$(@F)
+
+$(topoutdir)/$(dist.pkgname)-$(dist.version).tar: $(topoutdir)/$(dist.pkgname)-$(dist.version)
+ $(TAR) cf $@ -C $(<D) $(<F)
+$(topoutdir)/$(dist.pkgname)-$(dist.version).tar.gz: $(topoutdir)/$(dist.pkgname)-$(dist.version).tar
+ $(GZIP) $(GZIPFLAGS) < $< > $@
diff --git a/build-aux/write-ifchanged b/build-aux/write-ifchanged
new file mode 100755
index 0000000..185ceb0
--- /dev/null
+++ b/build-aux/write-ifchanged
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# Copyright (C) 2015 Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+outfile=$1
+tmpfile="$(dirname "$outfile")/.tmp${outfile##*/}"
+
+cat > "$tmpfile" || exit $?
+if cmp -s "$tmpfile" "$outfile"; then
+ rm -f "$tmpfile" || :
+else
+ mv -f "$tmpfile" "$outfile"
+fi